Add source files

.jshintrc

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+{
+  "esversion": 11
+}

README.md

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+# Primitive test engine for JavaScript
+
+Example `./tester.test.js`

package.json

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+{
+  "name": "js-test-tools",
+  "version": "1.0.0",
+  "description": "Primitive test tools for JavaScript",
+	"type": "module",
+  "main": "test-runner.js",
+  "scripts": {
+    "test": "node tester.test.js"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/abyr/js-test-tools.git"
+  },
+  "keywords": [
+    "js",
+    "unit",
+    "test"
+  ],
+  "author": "Oleksandr Denysenko",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/abyr/js-test-tools/issues"
+  },
+  "homepage": "https://github.com/abyr/js-test-tools#readme"
+}

test-runner.js

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+import * as path from "path";
+import * as util from "util";
+
+function group(name, tests) {
+    const relativeFilenameOrName = relativeFilename(name);
+
+    console.log(infoStr(relativeFilenameOrName));
+    console.group();
+    tests();
+    console.groupEnd();
+}
+
+const test = function (title, fn) {
+    const end = result(title);
+
+    try {
+        const fnRes = fn();
+
+        if (util.types.isPromise(fnRes)) {
+            fnRes.then(end).catch(end);
+        } else {
+            end();
+        }
+    } catch (err) {
+        end(err);
+    }
+};
+
+const result = title => err => {
+    if (err instanceof Error) {
+        console.log(``);
+        console.log(errorStr(`✖ ${title}`));
+        console.error(err.actual || err);
+    } else {
+        console.log(successStr(`✔ ${title}`));
+    }
+};
+
+function relativeFilename(filename) {
+    return path.relative(process.cwd(), filename);
+}
+
+const STR_GREEN = "\x1b[32m";
+const STR_RED = "\x1b[31m";
+const STR_YELLOW = "\x1b[33m";
+const STR_RESET = "\x1b[0m";
+
+function successStr(text) {
+    return "".concat(STR_GREEN).concat(text).concat(STR_RESET);
+}
+
+function infoStr(text) {
+    return "".concat(STR_YELLOW).concat(text).concat(STR_RESET);
+}
+
+function errorStr(text) {
+    return "".concat(STR_RED).concat(text).concat(STR_RESET);
+}
+
+export { group, test };

tester.js

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+const tester = {
+
+    fail: function(msg) {
+        throw new Error('fail(): ' + msg);
+    },
+
+    assert: function(value, msg) {
+        if (!value) {
+            throw new Error('assert(): ' + msg);
+        }
+    },
+
+    equals: function(expected, actual) {
+        if (expected !== actual) {
+            throw new Error('assertEquals() "' + expected + '" not equals "' + actual + '"');
+        }
+    }
+};
+
+export default tester;

tester.test.js

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+import { fileURLToPath } from 'url';
+import { group, test } from './test-runner.js';
+import tester from './tester.js';
+
+const filePath = fileURLToPath(import.meta.url);
+
+export default group(`${filePath}: self test`, () => {
+    test('assert', () => {
+        tester.assert(1);
+        tester.assert(1 == '1');
+        tester.assert(true);
+        tester.assert(!false);
+    });
+    test('equals', () => {        
+        tester.equals('1', '1');
+        tester.equals(true, !!1);
+        tester.equals(1, Number('1'));
+    });
+});